Hi Spec Smoke Detector

Hispec Mains Smoke Alarm Interlinked Connectable 240V - with 9V Battery Back Up

HiSPEC Interconnectable Fast Fix Mains Smoke Detector with 9v Battery HSSA/PE/FF

Hispec Interconnectable Fast Fix Mains Heat Detector c/w 9v Backup Battery Incl

Fire Angel ST-630-DET Thermoptek Smoke Detector Wireless Connectable Q-label

HiSPEC Battery Operated Smoke Detector Powered by a 10 Year Battery - HSA/BP/10

Kidde KF20 KF20 Mains-Powered Interconnectable Optical Smoke Alarm 230V